import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main1 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        int count = 0;
        StringBuffer ret = new StringBuffer();
        while(N != 0) {
            if(count == 3) {
                ret.append(",");
                count = 0;
            }else {
                ret.append(N % 10);
                count++;
                N /= 10;
            }
        }
        System.out.println(ret.reverse());
    }
}